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General control line discussion => Classifieds => Topic started by: Bootlegger on December 30, 2021, 01:15:01 PM

Title: McCoy 40 R/H thunder bolt
Post by: Bootlegger on December 30, 2021, 01:15:01 PM

would a thunder bolt Red head 40 take a piston and liner from a series 21 40 block and make a ringed stunt 40 ? all help will be appreciated,,, Much  obliged   n~ :! #^ y1

Title: Re: McCoy 40 R/H thunder bolt
Post by: Manuel Cortes on December 30, 2021, 09:49:14 PM

Hi Gil.

I think so, as I bought several years ago a called "hybrid McCoy 40" who has exactly that mod performed. What I don´t Know is if it is necessary some machining work to adapt the pieces.

Kind regards from Spain.

Manuel.

Title: Re: McCoy 40 R/H thunder bolt
Post by: Dave_Trible on December 31, 2021, 09:07:24 AM

Gil it can be done but requires the case to be bored out several thousandths to fit the Series 21 sleeve.  I attempted to do one recently by simply hogging it out with a grinding stone.  I got the engine together but couldn’t get it to start by hand.  I may take the electric starter next time I try.  I think once it gets loosed up....

Dave

Title: Re: McCoy 40 R/H thunder bolt
Post by: De Hill on December 31, 2021, 06:18:03 PM

It can also be done by taking the cylinder of a lightning bolt Mccoy .40 and using the rod and piston out of a series 21 Mccoy .40. Stick that assembly back into a lightning bolt Mccoy .40 crankshaft and crankcase.
Then you will have what you want.